ft_atoi.c

/* ************************************************************************** */
/*                                                                            */
/*                                                        :::      ::::::::   */
/*   ft_atoi.c                                          :+:      :+:    :+:   */
/*                                                    +:+ +:+         +:+     */
/*   By: mattig <marvin@42.fr>                      +#+  +:+       +#+        */
/*                                                +#+#+#+#+#+   +#+           */
/*   Created: 2021/10/21 11:03:24 by mattig            #+#    #+#             */
/*   Updated: 2021/10/30 17:57:04 by mattig           ###   ########.fr       */
/*                                                                            */
/* ************************************************************************** */

int	ft_atoi(const char *str)
{
	int	nbr;
	int	i;
	int	neg;

	i = 0;
	while ((str[i] >= 9 && str[i] <= 13) || str[i] == 32)
		i++;
	nbr = 0;
	neg = 0;
	if (str[i] == '+' || str[i] == '-')
	{
		if (str[i] == '-')
			neg = 1;
		i++;
	}
	while (str[i] >= 48 && str[i] <= 57)
	{
		nbr = nbr * 10 + str[i] - 48;
		i++;
	}
	if (neg)
	{
		nbr *= -1;
	}
	return (nbr);
}